NASA NTRS · 19790020199
Thickness measurement system
Abstract
An FM radar for the measurement of coal thickness wherein an FM transmitter is modulated by the combination of two signals; One, for example, could be a frequency of 100 Hz, and the other a frequency of 15 Hz. A horn-type antenna is used which is filled with a material having a dielectric constant approximating that of coal.
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Barr, T. A.. 1979-07-17. Thickness measurement system. https://ntrs.nasa.gov/citations/19790020199
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